bookmarks: use cmdutil.check_at_most_one_arg() for action

Differential Revision: https://phab.mercurial-scm.org/D7647

mercurial/commands.py

@@ -1226,13 +1226,9 b' def bookmark(ui, repo, *names, **opts):'
     rev = opts.get(b'rev')
     inactive = opts.get(b'inactive')  # meaning add/rename to inactive bookmark
 
-    selactions = [k for k in [b'delete', b'rename', b'list'] if opts.get(k)]
-    if len(selactions) > 1:
-        raise error.Abort(
-            _(b'--%s and --%s are incompatible') % tuple(selactions[:2])
-        )
-    if selactions:
-        action = selactions[0]
+    action = cmdutil.check_at_most_one_arg(opts, b'delete', b'rename', b'list')
+    if action:
+        pass
     elif names or rev:
         action = b'add'
     elif inactive:

tests/test-bookmarks.t

@@ -475,7 +475,7 b' incompatible options'
   $ cd repo
 
   $ hg bookmark -m Y -d Z
-  abort: --delete and --rename are incompatible
+  abort: cannot specify both --delete and --rename
   [255]
 
   $ hg bookmark -r 1 -d Z